Mass heater outdoor input

Hi there!!! Any advise or recomendation to buit a mass heater with outdoor input/firebox?. Im wondering if its possible to only have the mass battery inside the room in order to and make it 100% free smoke smell/dust.  It should be tto heat a tiny textile factory we have and it must be smoke-smell free. Im from Argentina!. Thanks for any help!!!

Hi Javier;   Welcome to Permies.

The short answer to your question is yes,  it could be done.
There are 2 styles of rocket stove. A traditional J tube which requires more attention or a new style Batch box ,hotter burning , harder to build, but once lit it is maintenance free for the next 1.25 hrs.
I do not know the climate where your factory is located. If it is a cold place then your outside firebox might need a small room to be located in.
I highly recommend locating a copy of "The Rocket Mass Heater Builders Guide" written by Ernie & Erica Wisner accomplished master builders with over a 1000 builds.